Case report: Primary adenocarcinoma NOS of the thymus and cytological features.

Aspirates of mediastinal neoplasms pose a unique diagnostic challenge due to the overlapping histologic characteristics of mediastinal lesions and the morphologic similarities between mediastinal neoplasms and those originating at other sites. Presented here is the first reported description of the cytomorphologic features of adenocarcinoma NOS of the thymus in aspirate and pleural effusion specimens. The morphologic similarities between thymic and metastatic adenocarcinomas and variable immunohistochemical staining patterns of thymic epithelial neoplasms underscore the importance of pathology-radiology correlation and the careful consideration of the clinical context in the interpretation of cytology specimens.